technetium

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Symbol:

Tc

Atomic Number:

43

Relative Atomic Mass:

98.9063 g mol^-1

Natural Abundance in Lithosphere, hydrosphere and atmosphere:

5 x 10^-16% (mass fraction)

Electron Configuration:

[Kr]4d⁶5s

Oxidation States:

VII

Atomic Radius:

135.2pm

Covalent Radius:

127pm

Ionic Radius:

56pm (for +7 oxidation state)

Melting Point:

2172°C

Density:

11.49 g cm^-3 (at 20°C)

First Ionisation Energy:

7.28 eV

Reduction Potential:

0.400V

for Tc²⁺ + 2e^- a Tc_(s)

Electronegativity (Allred and Rochow):

1.4